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Simplifying
16 * 16 + b2 = 20 * 20
Multiply 16 * 16
256 + b2 = 20 * 20
Multiply 20 * 20
256 + b2 = 400
Solving
256 + b2 = 400
Solving for variable 'b'.
Move all terms containing b to the left, all other terms to the right.
Add '-256' to each side of the equation.
256 + -256 + b2 = 400 + -256
Combine like terms: 256 + -256 = 0
0 + b2 = 400 + -256
b2 = 400 + -256
Combine like terms: 400 + -256 = 144
b2 = 144
Simplifying
b2 = 144
Take the square root of each side:
b = {-12, 12}
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